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Bizarre Plot Behavior


   I have encountered a strange problem in MMA for Windows(Ver.2.2).  I 
asked to plot a function which is a linearly bounded Cosine type function.  
When I plot on a certain interval, the first portion of the Cos wave(from 
(0,1) to (Pi/2,0)) is inverted and plotted from (0,-1) to (Pi/2,0).  The 
rest of the waveform is correct.  When I change the interval, the plot 
corrects itself.  Is there something in the sampling scheme that would 
cause this?  Has anyone else encountered this?
   
   Thanks in advance,
   Daryl
   
   P.S.  If anyone wants to see this, I'll send you the whole notebook but 
it's fairly lengthy so I figured I'd save you all the reading.



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